barber



IRA S. BARBER, OF

"rvr oratori.

YORK, N. Y.

N Ew

MACHINE FOR TURNING GVALS.

Specification of Letters Patent No. 29,852, dated September 4, 1850.

To all whom it may concern:

Be it known that I, IRA S. BARBER, of the city, county, and State of New York, have invented certain new and useful Improvements in Machinery for Cutting Oval Frames; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being made to the annexed drawing, making a part of this specification, in which- Figure I is a front view or elevation. Fig. II is a side View or elevation. Fig. III is a top or plan view.

Similar letters indicate throughout the figures.

My improvement lies in so arranging the cutter stocks in their supports, with reference to the pattern or guide, that from one pattern, oval frames of differing sizes, or widths, or both, may be cut. As heretofore constructed the pattern has been affixed to the rotating tableor face-plate, and the form, which is to be cut down to the shape desired, has been placed above this pattern, the lower end of the cutter-stock extending down far enough to rest against the side of the pattern. In this, the chips are apt to get between the pattern and the cutter-stock, thereby causing irregularities in the work. A different pattern has also been required for each variation, whether in the size or in the width of the frame to be cut. The first of these difiiculties I obviate by afiixing the form directly upon the rotating table and placing the pattern above the cutters, taking care however that the pattern shall be made to have its rotation exactly isochronous with that of the table. If the pattern be placed above the heads of the cutter-stocks; which is the position I prefer, the frames which carry the cutter stocks may be the parts which bear against the pattern and this I am enabled to make adjustable, so that from one pattern frames of any size or width, either larger or smaller than the pattern, may be made.

The construction may be as follows: At A4 in the annexed drawings is seen the rotating table, which is aii'ixed upon a vertical shaft or axis and made to rotate in the ordinary manner. It is also to be made capable of being raised and lowered, as usual, the devices for which are not represented to avoid unnecessary complication.

The cutter stocks (o) and (b) are hung in frames (c) and (0') which may vibrate similar parts upon a common center at the back of the machine, as seen at (d). This center (d) is the main driving shaft of the machine, and the cutter stocks are also driven by it, the belts being thus tight, whatever be the position of the cutters with regard to each other, in a manner well known. Above the frames (c) is placed the pattern (c), being affixed upon the under side of a gear wheel (f) which is parallel with the surface of the table A, the axis of the two being in the same line. The table A has teeth upon its rim which mesh into a long pinion on the counter-shaft (g), and the wheel (f) is also connected by a suitable train to the same shaft so that both the pattern and the table shall rotate alike.

Each cutter frame has across its upper part a sliding piece (71,) upon which is set a pin having a roller upon it at to bear against the rim of the pattern (e). The piece (It) may be moved along in its groove so that the pin may be thrown out to either side as desired, being held in place by a set-screw. The cutter-knives are secured to the stock by having a groove made on each side of the lower projection (5) of the stock, anda corresponding groove in a plate (m) which slides along the stock. The stock at this point is threaded and there is a nut to travel upon it. The cutter knives being put in place in the grooves the nut is brought down upon the plate (m) and holds all firm.

In operation the form to be cut is secured upon the table A in such posit-ion that it will coincide generally with the position of the pattern above it. The cutter frames are then to be withdrawn from resting against the pattern, to which they are kept by the weight (7c), and this withdrawal is effected by rods, seen at (c) Figs. I and III, both of which may be operated at the same time by using the lever The table is now to be raised up to the cutters, and the main driving shaft being put in motion t-he cutters will work down into the form until the rollers rest against the pattern. The shaft (g) is now to be thrown into gear with (d) and thus the movement of the form and of the pattern will commence, and being continued until the pattern and the table have made one full revolution the machine is to be stopped, the table lowered, and then the frame may be taken off, the cutting being completed. If a frame larger than the pattern, but of the same Width, is to be cut, the sliding pieces (h) of both are to be so set that the cutters will stand, when the rollers rest upon the pattern, at appropriate distances from each other, While, if only the Width of the traine is to be varied, either the slide of the outer or inner cutter may be moved, and thus the position of the cutters with regard to the pattern may beso varied that While frames of that particular forni, or relative proportion as to their major and minor axis, are desired, but one pattern Will be necessary for the machine. The cutter knives may be readily adjusted also to stand either close to or out from the cutte1'stock by merely slacking up the nut (n) a little, When the knife can be 2. The movable and adjustable patternv guides, whereby various sizes, shapes, and Widths, can loe out from one and the saine pattern.

IRA S. BARBER.

'Vitnesses I. P. PmssoN, S. H. MAYNARD. 

